Either way, both have been linked with summer moves to England – Rodriguez most regularly to Manchester United and Martinez to just about all of the Premier League elite.

But last weekend, it was another young player who kept Porto’s title challenge alive, scoring two late goals in a 3-1 win over Braga, including an outstanding volley direct from a corner kick.

Within 10 minutes of coming on as a substitute, 19-year-old Brazilian midfielder Kelvin had bagged a brace…which begs two questions.

The first is so what? Young players score all the time.

Federico Macheda thought he had made it after a last-gasp title-turning strike against Aston Villa. And where is he now? The same can be said for countless players before and after.

And the second question is: will Kelvin's apparent ability prompt his club to cash in on either of Rodriguez or Martinez this summer?

Those two strikes against Braga were Kelvin’s first for the senior team. This isn’t a let’s-get-carried-away type of article. It is more on the pondering side; because with the almost inevitable departure of at least one of their star forwards, it will be to the likes of Kelvin that Porto turn.

Braga got their revenge this weekend, beating Porto 1-0 in the Portuguese League Cup. Kelvin played just over half an hour to little effect.

But should United be seeking Rodriguez as a replacement for the seemingly-departing Nani, they will hope Kelvin is not a one-game wonder, but a realistic alternative to Porto’s regular goal-threats.

As an attacking midfielder he is not a direct replacement, but he has already proved he knows where the goal is. And at just 19 he has years to improve.

With the composure and natural goal-scoring ability he showed during his cameo, the future seems bright for Kelvin.

For United and other suitors of the teenager’s teammates, they will be hoping that proves to be true.

Should United make a move for Rodriguez...or even his teammate Martinez? And what would each player bring to the team?

Vincent Ralph

After graduating with a degree in English Literature, Vincent completed a NCTJ-accredited qualification in newspaper and magazine journalism in 2005. He has worked for HITC for four years and is now Head of Editorial and Journalist Standards.